Mediators of Change in Capnometry Guided Respiratory Intervention for Panic Disorder.

Capnometry guided respiratory interventions have shown promising results in the treatment of panic disorder, but mechanisms of change are not yet well-understood. The current study examined changes in end-tidal carbon dioxide (ETCO2), anxiety sensitivity, and perceived control as mediators of panic symptom change. Sixty-nine adults with panic disorder received 4 weeks of respiratory training, and panic symptom severity and potential mediators were assessed at Pre-treatment, Mid-treatment, Post-treatment, 2-month follow-up, and 12-month follow-up. Multilevel mediation analyses showed that changes in perceived control significantly mediated changes in panic disorder severity and that for individuals who were hypocapnic at pre-treatment, ETCO2 was a significant mediator of symptom outcome. Findings provide further evidence that changes in perceived control, and improvements in respiratory dysregulation for hypocapnic individuals specifically, underlie symptom improvement from capnometry guided respiratory intervention for panic disorder.

A Multisite Benchmarking Trial of Capnometry Guided Respiratory Intervention for Panic Disorder in Naturalistic Treatment Settings.

Panic disorder (PD) is associated with hyperventilation. The efficacy of a brief respiratory feedback program for PD has been established. The aim of the present study was to expand these results by testing a similar program with more clinically representative patients and settings. Sixty-nine adults with PD received 4 weeks of Capnometry Guided Respiratory Intervention (CGRI) using Freespira, which provides feedback of end-tidal CO2 (PETCO2) and respiration rate (RR), in four non-academic clinical settings. This intervention is delivered via home use following initial training by a clinician and provides remote monitoring of client adherence and progress by the clinician. Outcomes were assessed post-treatment and at 2- and 12-month follow-up. CGRI was associated with an intent-to-treat response rate of 83% and a remission rate of 54%, and large decreases in panic severity. Similar decreases were found in functional impairment and in global illness severity. Gains were largely sustained at follow-up. PETCO2 moved from the slightly hypocapnic range to the normocapnic range. Benchmarking analyses against a previously-published controlled trial showed very similar outcomes, despite substantial differences in sample composition and treatment settings. The present study confirms prior clinical results and lends further support to the viability of CGRI in the treatment of PD.

The Fear of Positive Evaluation Scale: psychometric properties in a clinical sample.

Cognitive models of social anxiety suggest that fear of negative evaluation (FNE) is the central cognitive dimension underlying the disorder. The Fear of Positive Evaluation Scale (FPES; Weeks, Heimberg, & Rodebaugh, 2008) was recently developed to assess an additional cognitive dimension purported to underlie social anxiety disorder (SAD), but its psychometric properties have yet to be examined in clinical populations. The present study, with 133 treatment-seeking patients, examined the applicability of the FPES with a clinical sample. Results indicated that the FPES was factorially distinct from a measure assessing FNE, and patients with SAD (n=51) had higher mean scores on the FPES than patients with other anxiety disorders (n=82). The FPES also showed adequate reliability (internal consistency), good convergent and discriminant validity, acceptable criterion-related validity in predicting social interaction anxiety symptoms, and appropriate sensitivity to treatment. The FPES appears to have good psychometric properties and is a promising new assessment tool for better understanding SAD.